REVERBERATION MEASUREMENTS OF THE INNER RADIUS OF THE DUST TORUS IN 17 SEYFERT GALAXIES [PDF]
, 2014 We present the results of a dust reverberation survey for 17 nearby Seyfert 1 galaxies, which provides the largest homogeneous data collection for the radius of the innermost dust torus. A delayed response of the K-band light curve after the V-band light
S. Koshida +10 more
semanticscholar +1 more source
Sub-parsec radio cores in nearby Seyfert galaxies [PDF]
, 2013 We present a census of sub-pc scale properties of the VLBI cores in a complete sample of local Seyfert galaxies. Seventeen out of 23 sources with a VLA detection are detected also with VLBI at 1.7 GHz and/or 5 GHz, with an average monochromatic radio ...
F. Panessa, M. Giroletti
semanticscholar +1 more source
The Multitude of Unresolved Continuum Sources at 1.6 microns in Hubble Space Telescope images of Seyfert Galaxies [PDF]
, 1999 We examine 112 Seyfert galaxies observed by the Hubble Space Telescope (HST) at 1.6 microns. We find that ~50% of the Seyfert 2.0 galaxies which are part of the Revised Shapeley-Ames (RSA) Catalog or the CfA redshift sample contain unresolved continuum ...
A. Alonso‐Herrero +18 more
core +5 more sources
NUCLEAR STAR FORMATION ACTIVITY AND BLACK HOLE ACCRETION IN NEARBY SEYFERT GALAXIES [PDF]
, 2013 Recent theoretical and observational works indicate the presence of a correlation between the star-formation rate (SFR) and active galactic nucleus (AGN) luminosity (and, therefore, the black hole accretion rate, ) of Seyfert galaxies.
P. Esquej +18 more
semanticscholar +1 more source
X-RAY VARIABILITY STUDY OF POLAR SCATTERED SEYFERT1 GALAXIES
Acta Polytechnica, 2014 We study 12 Seyfert 1 galaxies with a high level of optical polarization. Optical light emerging from the innermost regions is predominantly scattered in a polar region above the central engine directly in our line of sight.
Tobias Beuchert +6 more
doaj +1 more source
Spitzer/IRS Observations of Seyfert 1.8s and 1.9s: A Comparison with Seyfert 1s and Seyfert 2s [PDF]
, 2007 We present Spitzer Space Telescope mid-infrared spectra of 12 Seyfert 1.8 and 1.9 galaxies over the 5-38 um region. We compare the spectral characteristics of this sample to those of 58 Seyfert 1 and Seyfert 2 galaxies from the Spitzer archives.
Antonucci R. +11 more
core +3 more sources
Optical Properties of Two Complementary Samples of Intermediate Seyfert Galaxies
Physics, 2023 We present first results of the analysis of optical spectra of two complementary samples of Seyfert galaxies (Seyferts). The first sample was extracted from a selection of the 4th Fermi Gamma-ray Large Area Telescope (4FGL) catalog and consists of 11 γ ...
Benedetta Dalla Barba +5 more
doaj +1 more source
Unification of X-ray winds in Seyfert galaxies: from ultra-fast outflows to warm absorbers [PDF]
, 2012 The existence of ionized X-ray absorbing layers of gas along the line of sight to the nuclei of Seyfert galaxies is a well established observational fact. This material is systematically outflowing and shows a large range in parameters.
F. Tombesi +12 more
semanticscholar +1 more source
Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1 galaxies [PDF]
Astronomy & Astrophysics, 2018 We have detected six narrow-line Seyfert 1 (NLS1) galaxies at 37 GHz that were previously classified as radio silent and two that were classified as radio quiet.
A. Lähteenmäki +6 more
semanticscholar +1 more source
Relativistic jets in narrow-line Seyfert 1 galaxies. New discoveries and open questions
EPJ Web of Conferences, 2013 Before the launch of the Fermi satellite only two classes of AGNs were known to produce relativistic jets and thus emit up to the γ-ray energy range: blazars and radio galaxies, both hosted in giant elliptical galaxies.
D’Ammando F. +4 more
doaj +1 more source